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Add comprehensive webhook validation and processing system with Polar.sh integration: - Create built-in Standard Webhooks package following official specification - Implement HMAC-SHA256 signature validation with base64 encoding - Add webhook factory for multi-provider support (Polar, Stripe, generic) - Replace custom Polar webhook validation with Standard Webhooks implementation - Add proper exception handling with custom WebhookVerificationException - Support sandbox mode bypass for development environments - Update Polar provider to use database-driven configuration - Enhance webhook test suite with proper Standard Webhooks format - Add PaymentProvider model HasFactory trait for testing - Implement timestamp tolerance checking (±5 minutes) for replay protection - Support multiple signature versions and proper header validation This provides a secure, reusable webhook validation system that can be extended to other payment providers while maintaining full compliance with Standard Webhooks specification. BREAKING CHANGE: Polar webhook validation now uses Standard Webhooks format with headers 'webhook-id', 'webhook-timestamp', 'webhook-signature' instead of previous Polar-specific headers.
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